I like CPAN. A lot. CPAN is the killer app.

I generally like the community attitude, talent and expressiveness.

I dislike the bolted-on OOP, for the times when I like to use OOP.

I like that Perl is available for everything, everywhere, and it doesn't get in your way.

I like the mallability of the language, but I dislike the solution to "fix" Perl (and Perl OO) by source filters rather than language design (lots of OO modules are an example).